The houses in Mohen-jo-Daro were built on high plinth for protection from floods or dampness of any sort. The houses owned by the rich had two storeys and had five to seven rooms. The poor had single-storey houses with two to three rooms. The main entrance to all the houses was in the side lanes. The residential building were built according to a set plan on a high mound in order to protect them from floods. Each house had covered drains, connected with street drains.